#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main() {
	ll N;
	ll M;
	cin >> N;
	cin >> M;
	for (ll i = 0; i <= 100000000; i++) {
		if (1000 * i <= N / M && N / M < 1000 * (i + 1)) {
			cout << 1000 * i << endl;
			break;
		}
	}
}